<template>
  <div class="search-container">
    <!-- 在 van-search 外层增加 form 标签，且 action 不为空，即可在 iOS 输入法中显示搜索按钮。 -->
    <form action="/">
      <van-search
        v-model="searchText"
        show-action
        placeholder="请输入搜索关键词"
        background="#3296fa"
        @search="onSearch"
        @cancel="onCancel"
        @focus="isResultShow = false"
      />
    </form>
    <!-- 搜索结果 -->
    <search-result v-if="isResultShow" :search-text="searchText" />
    <!-- 联想建议 -->
    <search-suggestion v-else-if='searchText' :search-text="searchText" @search="onSearch" />
    <!-- 搜索历史记录 -->
    <search-history v-else :search-histories="searchHistories" @clear-search-histories="searchHistories = []" @search="onSearch" />
  </div>
</template>

<script>
import searchHistory from './components/search-history.vue'
import searchSuggestion from './components/search-suggestion.vue'
import searchResult from './components/search-result.vue'
// 导入本地存储中封装的 setItem, getItem 方法
import { setItem, getItem } from '@/utils/storage.js'
export default {
  name: 'SearchIndex',
  data () {
    return {
      searchText: '',
      isResultShow: false, // 控制搜索结果的显示状态
      searchHistories: getItem('TOUTIAO_SEARCH_HISTORY') || [] // 初始化的时候获取存储历史记录
    }
  },
  components: {
    searchHistory,
    searchSuggestion,
    searchResult
  },
  watch: {
    searchHistories (value) {
      // 同步搜索数据到本地
      setItem('TOUTIAO_SEARCH_HISTORY', value)
    }
  },
  methods: {
    onSearch (val) {
      console.log(val)
      //  更新文本框的内容
      this.searchText = val
      // 存储搜索历史记录
      // 不要有重复历史记录、最新的排在最前面
      const index = this.searchHistories.indexOf(val)
      if (index !== -1) {
        this.searchHistories.splice(index, 1)
      }

      this.searchHistories.unshift(val)
      // 渲染搜索结果
      this.isResultShow = true
    },
    onCancel () {
      this.$router.back()
    }
  },

  created () {
  }
}
</script>

<style lang='less' scoped>
.search-container {
  .van-search__action {
    color: #fff;
  }
}
</style>
